Registry value is very easy to implement.

just use

using Microsoft.Win32;

& for insert use this code

private void button1_Click(object sender, EventArgs e)
{
 try
 {
 RegistryKey regkey = Registry.CurrentUser;
 regkey = regkey.CreateSubKey (@"Software\Tanmay\Sample"); //path
 if (regkey != null)
 {
 regkey.SetValue("Test", "Hello World"); //Value Name,Value Data
 }
 }
 catch (Exception ex)
 {
 MessageBox.Show(ex.Message);
 }
}

& for getting Registry value from registry use it..

private void button2_Click(object sender, EventArgs e)
{
 try
 {
 RegistryKey regkey = Registry.CurrentUser;
 regkey = regkey.CreateSubKey(@"Software\Tanmay\Sample"); //path
 string Br = (string)regkey.GetValue("Test");
 textBox1.Text = Br;
 }
 catch(Exception ex)
 {
 MessageBox.Show(ex.Message);
}
}

That's all.

Here I use only Registry.CurrentUser you can change it on your demand.

Thank you.